This is Diego. A very happy 100-year-old tortoise.

Photo by Rodrigo Buenida/AFP/Getty Images.

He's originally from the San Diego Zoo (hence the name) and was brought to the Galapagos Islands in the 1977. He's been living there ever since.

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The kakapo parrot is one of the most endangered species in the world.

There are currently fewer than 200 of the flightless birds from New Zealand on the planet. That's a big problem, especially when you consider that (surprise, surprise) human beings are largely responsible for their dwindling population.

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In late March 2016, World Wildlife Fund researchers celebrated the reappearance of the incredibly rare Sumatran rhino.

Image from International Rhino Foundation/WIkimedia Commons.

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